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🔧 启用SSE

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fslongjin
2022-02-21 23:24:51 +08:00
parent d9d83335af
commit 63cc5c2b33
3 changed files with 12 additions and 3 deletions
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10
kernel/head.S
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@ -453,7 +453,15 @@ SetUp_TSS64:
// 装载任务状态段寄存器(已改为在main.c中使用load_TR宏进行装载)
// mov $0x50, %ax // 设置起始地址为80
// ltr %ax
//now enable SSE and the like
movq %cr0, %rax
and $0xFFFB, %ax //clear coprocessor emulation CR0.EM
or $0x2, %ax //set coprocessor monitoring CR0.MP
movq %rax, %cr0
movq %cr4, %rax
or $(3 << 9), %ax //set CR4.OSFXSR and CR4.OSXMMEXCPT at the same time
movq %rax, %cr4
call Start_Kernel